Making PowerShell adapter and class-based resources cross-platform

build.ps1

@@ -324,10 +324,13 @@ if (!$Clippy -and !$SkipBuild) {
 if ($Test) {
     $failed = $false
 
-    $FullyQualifiedName = @{ModuleName="PSDesiredStateConfiguration";ModuleVersion="2.0.7"}
-    if (-not(Get-Module -ListAvailable -FullyQualifiedName $FullyQualifiedName))
-    {   "Installing module PSDesiredStateConfiguration 2.0.7"
-        Install-PSResource -Name PSDesiredStateConfiguration -Version 2.0.7 -Repository PSGallery -TrustRepository
+    if ($IsWindows) {
+        # PSDesiredStateConfiguration module is needed for Microsoft.Windows/WindowsPowerShell adapter
+        $FullyQualifiedName = @{ModuleName="PSDesiredStateConfiguration";ModuleVersion="2.0.7"}
+        if (-not(Get-Module -ListAvailable -FullyQualifiedName $FullyQualifiedName))
+        {   "Installing module PSDesiredStateConfiguration 2.0.7"
+            Install-PSResource -Name PSDesiredStateConfiguration -Version 2.0.7 -Repository PSGallery -TrustRepository
+        }
     }
 
     if (-not(Get-Module -ListAvailable -Name Pester))

powershell-adapter/Tests/powershellgroup.config.tests.ps1

@@ -24,7 +24,7 @@ Describe 'PowerShell adapter resource tests' {
         Remove-Item -Force -ea SilentlyContinue -Path $cacheFilePath
     }
 
-    It 'Get works on config with class-based resources' -Skip:(!$IsWindows){
+    It 'Get works on config with class-based resources' {
 
         $r = Get-Content -Raw $pwshConfigPath | dsc config get
         $LASTEXITCODE | Should -Be 0
@@ -33,23 +33,23 @@ Describe 'PowerShell adapter resource tests' {
         $res.results[0].result.actualState.result[0].properties.EnumProp | Should -BeExactly 'Expected'
     }
 
-    It 'Test works on config with class-based resources' -Skip:(!$IsWindows){
+    It 'Test works on config with class-based resources' {
 
         $r = Get-Content -Raw $pwshConfigPath | dsc config test
         $LASTEXITCODE | Should -Be 0
         $res = $r | ConvertFrom-Json
         $res.results[0].result.actualState.result[0] | Should -Not -BeNull
     }
 
-    It 'Set works on config with class-based resources' -Skip:(!$IsWindows){
+    It 'Set works on config with class-based resources' {
 
         $r = Get-Content -Raw $pwshConfigPath | dsc config set
         $LASTEXITCODE | Should -Be 0
         $res = $r | ConvertFrom-Json
         $res.results.result.afterState.result[0].type | Should -Be "TestClassResource/TestClassResource"
     }
 
-    It 'Export works on config with class-based resources' -Skip:(!$IsWindows){
+    It 'Export works on config with class-based resources' {
 
         $yaml = @'
             $schema: https://raw.githubusercontent.com/PowerShell/DSC/main/schemas/2024/04/config/document.json
@@ -71,20 +71,21 @@ Describe 'PowerShell adapter resource tests' {
         $res.resources[0].properties.result[0].Prop1 | Should -Be "Property of object1"
     }
 
-    It 'Custom psmodulepath in config works' -Skip:(!$IsWindows){
+    It 'Custom psmodulepath in config works' {
 
         $OldPSModulePath  = $env:PSModulePath
         Copy-Item -Recurse -Force -Path "$PSScriptRoot/TestClassResource" -Destination $TestDrive
         Rename-Item -Path "$PSScriptRoot/TestClassResource" -NewName "_TestClassResource"
 
         try {
+            $psmp = "`$env:PSModulePath"+[System.IO.Path]::PathSeparator+$TestDrive
             $yaml = @"
             `$schema: https://raw.githubusercontent.com/PowerShell/DSC/main/schemas/2024/04/config/document.json
             resources:
             - name: Working with class-based resources
               type: Microsoft.DSC/PowerShell
               properties:
-                psmodulepath: `$env:PSModulePath;$TestDrive
+                psmodulepath: $psmp
                 resources:
                 - name: Class-resource Info
                   type: TestClassResource/TestClassResource
@@ -104,7 +105,7 @@ Describe 'PowerShell adapter resource tests' {
         }
     }
 
-    It 'DSCConfigRoot macro is working when config is from a file' -Skip:(!$IsWindows){
+    It 'DSCConfigRoot macro is working when config is from a file' {
 
         $yaml = @"
             `$schema: https://raw.githubusercontent.com/PowerShell/DSC/main/schemas/2024/04/config/document.json
@@ -129,7 +130,7 @@ Describe 'PowerShell adapter resource tests' {
         $res.results.result.actualState.result.properties.Prop1 | Should -Be $TestDrive
     }
 
-    It 'DSC_CONFIG_ROOT env var is cwd when config is piped from stdin' -Skip:(!$IsWindows){
+    It 'DSC_CONFIG_ROOT env var is cwd when config is piped from stdin' {
 
         $yaml = @"
             `$schema: https://raw.githubusercontent.com/PowerShell/DSC/main/schemas/2024/04/config/document.json

powershell-adapter/Tests/powershellgroup.resource.tests.ps1

@@ -23,48 +23,47 @@ Describe 'PowerShell adapter resource tests' {
         Remove-Item -Force -ea SilentlyContinue -Path $cacheFilePath
     }
 
-    It 'Discovery includes class-based and script-based resources ' -Skip:(!$IsWindows){
+    It 'Discovery includes class-based resources' {
 
-        $r = dsc resource list * -a Microsoft.DSC/PowerShell
+        $r = dsc resource list '*' -a Microsoft.DSC/PowerShell
         $LASTEXITCODE | Should -Be 0
         $resources = $r | ConvertFrom-Json
         ($resources | ? {$_.Type -eq 'TestClassResource/TestClassResource'}).Count | Should -Be 1
-        ($resources | ? {$_.Type -eq 'PSTestModule/TestPSRepository'}).Count | Should -Be 1
     }
 
-    It 'Get works on class-based resource' -Skip:(!$IsWindows){
+    It 'Get works on class-based resource' {
 
         $r = "{'Name':'TestClassResource1'}" | dsc resource get -r 'TestClassResource/TestClassResource'
         $LASTEXITCODE | Should -Be 0
         $res = $r | ConvertFrom-Json
         $res.actualState.result.properties.Prop1 | Should -BeExactly 'ValueForProp1'
     }
 
-    It 'Get uses enum names on class-based resource' -Skip:(!$IsWindows){
+    It 'Get uses enum names on class-based resource' {
 
         $r = "{'Name':'TestClassResource1'}" | dsc resource get -r 'TestClassResource/TestClassResource'
         $LASTEXITCODE | Should -Be 0
         $res = $r | ConvertFrom-Json
         $res.actualState.result.properties.EnumProp | Should -BeExactly 'Expected'
     }
 
-    It 'Test works on class-based resource' -Skip:(!$IsWindows){
+    It 'Test works on class-based resource' {
 
         $r = "{'Name':'TestClassResource1','Prop1':'ValueForProp1'}" | dsc resource test -r 'TestClassResource/TestClassResource'
         $LASTEXITCODE | Should -Be 0
         $res = $r | ConvertFrom-Json
         $res.actualState.result.properties.InDesiredState | Should -Be $True
     }
 
-    It 'Set works on class-based resource' -Skip:(!$IsWindows){
+    It 'Set works on class-based resource' {
 
         $r = "{'Name':'TestClassResource1','Prop1':'ValueForProp1'}" | dsc resource set -r 'TestClassResource/TestClassResource'
         $LASTEXITCODE | Should -Be 0
         $res = $r | ConvertFrom-Json
         $res.afterState.result | Should -Not -BeNull
     }
 
-    It 'Export works on PS class-based resource' -Skip:(!$IsWindows){
+    It 'Export works on PS class-based resource' {
 
         $r = dsc resource export -r TestClassResource/TestClassResource
         $LASTEXITCODE | Should -Be 0
@@ -74,7 +73,7 @@ Describe 'PowerShell adapter resource tests' {
         $res.resources[0].properties.result[0].Prop1 | Should -Be "Property of object1"
     }
 
-    It 'Get --all works on PS class-based resource' -Skip:(!$IsWindows){
+    It 'Get --all works on PS class-based resource' {
 
         $r = dsc resource get --all -r TestClassResource/TestClassResource
         $LASTEXITCODE | Should -Be 0

powershell-adapter/psDscAdapter/powershell.resource.ps1

@@ -9,6 +9,24 @@ param(
     [string]$jsonInput = '@{}'
 )
 
+function Write-DscTrace {
+    param(
+        [Parameter(Mandatory = $false)]
+        [ValidateSet('Error', 'Warn', 'Info', 'Debug', 'Trace')]
+        [string]$Operation = 'Debug',
+        [Parameter(Mandatory = $true, ValueFromPipeline = $true)]
+        [string]$Message
+    )
+
+    $trace = @{$Operation = $Message } | ConvertTo-Json -Compress
+    $host.ui.WriteErrorLine($trace)
+}
+
+# Adding some debug info to STDERR
+'PSVersion=' + $PSVersionTable.PSVersion.ToString() | Write-DscTrace
+'PSPath=' + $PSHome | Write-DscTrace
+'PSModulePath=' + $env:PSModulePath | Write-DscTrace
+
 if ('Validate' -ne $Operation) {
     # write $jsonInput to STDERR for debugging
     $trace = @{'Debug' = 'jsonInput=' + $jsonInput } | ConvertTo-Json -Compress
@@ -21,14 +39,15 @@ if ('Validate' -ne $Operation) {
     else {
         $psDscAdapter = Import-Module "$PSScriptRoot/psDscAdapter.psd1" -Force -PassThru
     }
-
 
     # initialize OUTPUT as array
     $result = [System.Collections.Generic.List[Object]]::new()
 }
 
 if ($jsonInput) {
-    $inputobj_pscustomobj = $jsonInput | ConvertFrom-Json
+    if ($jsonInput -ne '@{}') {
+        $inputobj_pscustomobj = $jsonInput | ConvertFrom-Json
+    }
     $new_psmodulepath = $inputobj_pscustomobj.psmodulepath
     if ($new_psmodulepath)
     {
@@ -48,6 +67,7 @@ switch ($Operation) {
             $DscResourceInfo = $dscResource.DscResourceInfo
 
             # Provide a way for existing resources to specify their capabilities, or default to Get, Set, Test
+            # TODO: for perf, it is better to take capabilities from psd1 in Invoke-DscCacheRefresh, not by extra call to Get-Module
             if ($DscResourceInfo.ModuleName) {
                 $module = Get-Module -Name $DscResourceInfo.ModuleName -ListAvailable | Sort-Object -Property Version -Descending | Select-Object -First 1
                 if ($module.PrivateData.PSData.DscCapabilities) {
@@ -82,7 +102,7 @@ switch ($Operation) {
             [resourceOutput]@{
                 type           = $dscResource.Type
                 kind           = 'Resource'
-                version        = $DscResourceInfo.version.ToString()
+                version        = [string]$DscResourceInfo.version
                 capabilities   = $capabilities
                 path           = $DscResourceInfo.Path
                 directory      = $DscResourceInfo.ParentPath
@@ -159,14 +179,3 @@ class resourceOutput {
     [string] $requireAdapter
     [string] $description
 }
-
-# Adding some debug info to STDERR
-$trace = @{'Debug' = 'PSVersion=' + $PSVersionTable.PSVersion.ToString() } | ConvertTo-Json -Compress
-$host.ui.WriteErrorLine($trace)
-$trace = @{'Debug' = 'PSPath=' + $PSHome } | ConvertTo-Json -Compress
-$host.ui.WriteErrorLine($trace)
-$m = Get-Command 'Get-DscResource'
-$trace = @{'Debug' = 'Module=' + $m.Source.ToString() } | ConvertTo-Json -Compress
-$host.ui.WriteErrorLine($trace)
-$trace = @{'Debug' = 'PSModulePath=' + $env:PSModulePath } | ConvertTo-Json -Compress
-$host.ui.WriteErrorLine($trace)